Airstream INTERNATIONAL TRAILER Owner's Manual page 72

AIRSTREAM INTERNATIONAL TRAILER OWNERS MANUAL
Replacement of Micro Switch
Occasionally the micro switch fails or an electrode is broken off. Proceed as follows: Remove the two
screws holding the cap to the main body. Remember, this cap retains a spring under compression. With
both screws out, allow the spring to extend fully. Then carefully lift off cap and spring. If only the micro
switch is at fault, avoid disturbing the hydraulic elements remaining in the head. If examination of the
hydraulic parts is required, remove them carefully by pulling. Be sure to note the order of removal.
To replace the micro switch, remove the spring and pull out the black retaining ring. This will allow the
micro switch to fall free. Replace parts in the reverse sequence: Micro switch, black retainer, and the
spring.
Reassemble cover to the main body. Switch cap may be pointed up or down as desired, providing wire has
not been shorted.
After replacing the micro switch, carefully rewire correctly.
Note: If the positive wire from the battery is connected to the "B" terminal, the switch is bypassed and the
pump cannot shut off, Pressure will build up until the motor stalls. If the proper fuse has been used, it will
blow. If a larger fuse than recommended has been used, the motor will stall and may burn out.
Check Valve Problems
Due to contamination from debris or lime build-up, the check valve may fail to properly seat. To correct,
clean out the area and replace the check valve element. If checking the check valve with air, be certain to
moisten the check valve to get an accurate check. The rubber seals more effectively when wet.
Properly installed, the Pump will:
PRIME: The pump will automatically prime itself.
AIR-LOCK- Pump will not airlock, as the compression stroke is powerful enough to pressurize the
entrapped air and force the check valve open.
RUN DRY: Pump will run dry for extended periods without damage.
BATTERY DRAIN: At free flow, the pump draws a mere 7 to 7 1/2 amps.
CHECK VALVE: Built-in check valve prevents back flow and can protect the pump from the dangers of
high city water pressure (up to 200 PSI).
FULLY AUTOMATIC: The pump will automatically come on when the faucet or valve is opened. It
delivers a smooth, steady flow of water and shuts off automatically when the faucet is closed.
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